html,body{
    width: 100%;
    height: 100%;
    padding: 0;
    margin:0;
}

.three_top{
    width: 100%;
    text-align: center;
    font-weight: bold;
    font-size: 30px;
    color: gray;
}

.child:hover{
    transition: 1s all;
    box-shadow: 0 0 3px 3px #71bbb6;
}

.three_body{
    margin-top: 80px;
    display: flex;
    flex-wrap: wrap;
}
.child_top{
    text-align: center;
    color: gray;
    font-weight: bold;
}
.child{
    width: 23%;
    display: flex;
    flex-direction: column;
    justify-content: start;
    margin-top: 20px;
    padding: 1%;
    cursor: pointer;
    min-height: 200px;
}

.body > .chunk > .two > .two_top{
    width: 100%;
    text-align: center;
    font-weight: bold;
    font-size: 30px;
    color: gray;
}

.body > .chunk > .two > .two_bottom > div > ul{
    padding-top: 50px;
    box-sizing: border-box;
}


.body > .chunk > .two > .two_bottom > div > ul > li{
    height: 80px;
}

.body > .chunk > .two > .two_bottom{
    display: flex;
    justify-content: center;
    width: 100%;
    flex-wrap: wrap;
    font-size: 20px;
}
.body > .chunk > .two > .two_bottom > div:nth-child(1){
    padding-right: 30px;
    box-sizing: border-box;
    justify-content: flex-end;
    display: flex;
    width: 50%;
}

.body > .chunk > .two > .two_bottom > div:nth-child(2){
    padding-left: 30px;
    box-sizing: border-box;
    width: 50%;
}

.body > .chunk > .two{
    display: flex;
    flex-direction: column;
    width: 100%;
}

.body > .chunk > .one > div > img{
    width: 80%;
    height: 400px;
    border-radius: 15px;
}

.body > .chunk > .one > div{
    width: 50%;
    height: 400px;
}
.body > .chunk > .one > .one_left{
    display: flex;
    justify-content: flex-end;
    justify-items: right;
    padding-right: 30px;
    box-sizing: border-box;

}

.one_right:hover{
    cursor: pointer;
    box-shadow: 0 0 3px 3px #71bbb6;
    transition: 1s all;
}

.body > .chunk > .one > .one_right{
    padding-left: 30px;
    box-sizing: border-box;
}

.body > .chunk > .one > .one_right > p{
    font-size: 20px;
    font-family: "微软雅黑";
}
.body > .chunk > .one > .one_right > span{
    font-size: 40px;
    font-family: "楷体";
    font-weight: bold;
    box-sizing: border-box;
    display: block;
    color: gray;
    padding-top: 50px;
}

.body > .chunk > .one{
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.body{
    width: 80%;
    margin:auto;
}
.body > .chunk{
    width: 100%;
    min-height: 400px;
    margin-top: 100px;
    color: #aaa;
}

.banner{
    width: 100%;
    height: 600px;

    display: flex;
    justify-content: center;
    align-items: center;
    border-bottom: 2px solid #71bbb6;
}
.banner_middle{
    justify-content: center;
}
.middle_img{
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.middle_img img{
    width: 1200px;
    height: 500px;
}
